When I did 5 mile, IIRC my instructor told me not to downshift at 1, and I agree. It's a fast corner and your turbo should have enough grunt before you need to brake for 2.
Corner 10 really depends on your speed, I can't really remember but I'm pretty sure I downshifted by the time I was at corner 11. TBH 10-11 is pretty short so it's more important to set yourself up correctly to make 11 and get a good run down the straight.
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